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<h2><span class="refentrytitle"><a name="gio-Watching-Bus-Names.top_of_page"></a>Watching Bus Names</span></h2>
<p>Watching Bus Names — Simple API for watching bus names</p>
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<div class="refsynopsisdiv">
<a name="gio-Watching-Bus-Names.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gio/gio.h&gt;

<span class="returnvalue">void</span>                (<a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()">*GBusNameAppearedCallback</a>)         (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name_owner</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<span class="returnvalue">void</span>                (<a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()">*GBusNameVanishedCallback</a>)         (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
enum                <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags">GBusNameWatcherFlags</a>;
<a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()">g_bus_watch_name</a>                    (<em class="parameter"><code><a class="link" href="GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);
<a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-on-connection" title="g_bus_watch_name_on_connection ()">g_bus_watch_name_on_connection</a>      (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()">g_bus_unwatch_name</a>                  (<em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> watcher_id</code></em>);
<a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-with-closures" title="g_bus_watch_name_with_closures ()">g_bus_watch_name_with_closures</a>      (<em class="parameter"><code><a class="link" href="GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);
<a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-on-connection-with-closures" title="g_bus_watch_name_on_connection_with_closures ()">g_bus_watch_name_on_connection_with_closures</a>
                                                        (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gio-Watching-Bus-Names.description"></a><h2>Description</h2>
<p>
Convenience API for watching bus names.
</p>
<p>
</p>
<div class="example">
<a name="gdbus-watching-names"></a><p class="title"><b>Example 9. Simple application watching a name</b></p>
<div class="example-contents">
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        <td class="listing_code"><pre class="programlisting"><span class="preproc">#include</span><span class="normal"> </span><span class="string">&lt;gio/gio.h&gt;</span>

<span class="keyword">static</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">opt_name         </span><span class="symbol">=</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">;</span>
<span class="keyword">static</span><span class="normal"> </span><span class="usertype">gboolean</span><span class="normal"> opt_system_bus </span><span class="symbol">=</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">;</span>
<span class="keyword">static</span><span class="normal"> </span><span class="usertype">gboolean</span><span class="normal"> opt_auto_start </span><span class="symbol">=</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">;</span>

<span class="keyword">static</span><span class="normal"> </span><span class="usertype">GOptionEntry</span><span class="normal"> opt_entries</span><span class="symbol">[]</span><span class="normal"> </span><span class="symbol">=</span>
<span class="cbracket">{</span>
<span class="normal">  </span><span class="cbracket">{</span><span class="normal"> </span><span class="string">"name"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">'n'</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Commandline-option-parser.html#G-OPTION-ARG-STRING:CAPS">G_OPTION_ARG_STRING</a></span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">opt_name</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"Name to watch"</span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a> </span><span class="cbracket">}</span><span class="symbol">,</span>
<span class="normal">  </span><span class="cbracket">{</span><span class="normal"> </span><span class="string">"system-bus"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">'s'</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Commandline-option-parser.html#G-OPTION-ARG-NONE:CAPS">G_OPTION_ARG_NONE</a></span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">opt_system_bus</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"Use the system-bus instead of the session-bus"</span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a> </span><span class="cbracket">}</span><span class="symbol">,</span>
<span class="normal">  </span><span class="cbracket">{</span><span class="normal"> </span><span class="string">"auto-start"</span><span class="symbol">,</span><span class="normal"> </span><span class="string">'a'</span><span class="symbol">,</span><span class="normal"> </span><span class="number">0</span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Commandline-option-parser.html#G-OPTION-ARG-NONE:CAPS">G_OPTION_ARG_NONE</a></span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">opt_auto_start</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"Instruct the bus to launch an owner for the name"</span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="cbracket">}</span><span class="symbol">,</span>
<span class="normal">  </span><span class="cbracket">{</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="cbracket">}</span>
<span class="cbracket">}</span><span class="symbol">;</span>

<span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">on_name_appeared</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GDBusConnection</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">connection</span><span class="symbol">,</span>
<span class="normal">                  </span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal">     </span><span class="symbol">*</span><span class="normal">name</span><span class="symbol">,</span>
<span class="normal">                  </span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal">     </span><span class="symbol">*</span><span class="normal">name_owner</span><span class="symbol">,</span>
<span class="normal">                  </span><span class="usertype">gpointer</span><span class="normal">         user_data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal">  </span><span class="function"><a href="./../glib/glib/glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Name %s on %s is owned by %s</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span>
<span class="normal">           name</span><span class="symbol">,</span>
<span class="normal">           opt_system_bus </span><span class="symbol">?</span><span class="normal"> </span><span class="string">"the system bus"</span><span class="normal"> </span><span class="symbol">:</span><span class="normal"> </span><span class="string">"the session bus"</span><span class="symbol">,</span>
<span class="normal">           name_owner</span><span class="symbol">);</span>
<span class="cbracket">}</span>

<span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
<span class="function">on_name_vanished</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GDBusConnection</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">connection</span><span class="symbol">,</span>
<span class="normal">                  </span><span class="keyword">const</span><span class="normal"> </span><span class="usertype">gchar</span><span class="normal">     </span><span class="symbol">*</span><span class="normal">name</span><span class="symbol">,</span>
<span class="normal">                  </span><span class="usertype">gpointer</span><span class="normal">         user_data</span><span class="symbol">)</span>
<span class="cbracket">{</span>
<span class="normal">  </span><span class="function"><a href="./../glib/glib/glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Name %s does not exist on %s</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span>
<span class="normal">           name</span><span class="symbol">,</span>
<span class="normal">           opt_system_bus </span><span class="symbol">?</span><span class="normal"> </span><span class="string">"the system bus"</span><span class="normal"> </span><span class="symbol">:</span><span class="normal"> </span><span class="string">"the session bus"</span><span class="symbol">);</span>
<span class="cbracket">}</span>

<span class="type">int</span>
<span class="function">main</span><span class="normal"> </span><span class="symbol">(</span><span class="type">int</span><span class="normal"> argc</span><span class="symbol">,</span><span class="normal"> </span><span class="type">char</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">argv</span><span class="symbol">[])</span>
<span class="cbracket">{</span>
<span class="normal">  </span><span class="usertype">guint</span><span class="normal"> watcher_id</span><span class="symbol">;</span>
<span class="normal">  </span><span class="usertype">GMainLoop</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">loop</span><span class="symbol">;</span>
<span class="normal">  </span><span class="usertype">GOptionContext</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">opt_context</span><span class="symbol">;</span>
<span class="normal">  </span><span class="usertype">GError</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">error</span><span class="symbol">;</span>
<span class="normal">  </span><span class="usertype">GBusNameWatcherFlags</span><span class="normal"> flags</span><span class="symbol">;</span>

<span class="normal">  </span><span class="function"><a href="./../gobject/gobject/gobject-Type-Information.html#g-type-init">g_type_init</a></span><span class="normal"> </span><span class="symbol">();</span>

<span class="normal">  error </span><span class="symbol">=</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">;</span>
<span class="normal">  opt_context </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="./../glib/glib/glib-Commandline-option-parser.html#g-option-context-new">g_option_context_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"g_bus_watch_name() example"</span><span class="symbol">);</span>
<span class="normal">  </span><span class="function"><a href="./../glib/glib/glib-Commandline-option-parser.html#g-option-context-set-summary">g_option_context_set_summary</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_context</span><span class="symbol">,</span>
<span class="normal">                                </span><span class="string">"Example: to watch the power manager on the session bus, use:</span><span class="specialchar">\n</span><span class="string">"</span>
<span class="normal">                                </span><span class="string">"</span><span class="specialchar">\n</span><span class="string">"</span>
<span class="normal">                                </span><span class="string">"  ./example-watch-name -n org.gnome.PowerManager"</span><span class="symbol">);</span>
<span class="normal">  </span><span class="function"><a href="./../glib/glib/glib-Commandline-option-parser.html#g-option-context-add-main-entries">g_option_context_add_main_entries</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_context</span><span class="symbol">,</span><span class="normal"> opt_entries</span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>
<span class="normal">  </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(!</span><span class="function"><a href="./../glib/glib/glib-Commandline-option-parser.html#g-option-context-parse">g_option_context_parse</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_context</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">argv</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&amp;</span><span class="normal">error</span><span class="symbol">))</span>
<span class="normal">    </span><span class="cbracket">{</span>
<span class="normal">      </span><span class="function"><a href="./../glib/glib/glib-Warnings-and-Assertions.html#g-printerr">g_printerr</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Error parsing options: %s"</span><span class="symbol">,</span><span class="normal"> error</span><span class="symbol">-&gt;</span><span class="normal">message</span><span class="symbol">);</span>
<span class="normal">      </span><span class="keyword">goto</span><span class="normal"> out</span><span class="symbol">;</span>
<span class="normal">    </span><span class="cbracket">}</span>
<span class="normal">  </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_name </span><span class="symbol">==</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">)</span>
<span class="normal">    </span><span class="cbracket">{</span>
<span class="normal">      </span><span class="function"><a href="./../glib/glib/glib-Warnings-and-Assertions.html#g-printerr">g_printerr</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Incorrect usage, try --help.</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">);</span>
<span class="normal">      </span><span class="keyword">goto</span><span class="normal"> out</span><span class="symbol">;</span>
<span class="normal">    </span><span class="cbracket">}</span>

<span class="normal">  flags </span><span class="symbol">=</span><span class="normal"> <a href="gio-Watching-Bus-Names.html#G-BUS-NAME-WATCHER-FLAGS-NONE:CAPS">G_BUS_NAME_WATCHER_FLAGS_NONE</a></span><span class="symbol">;</span>
<span class="normal">  </span><span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_auto_start</span><span class="symbol">)</span>
<span class="normal">    flags </span><span class="symbol">|=</span><span class="normal"> <a href="gio-Watching-Bus-Names.html#G-BUS-NAME-WATCHER-FLAGS-AUTO-START:CAPS">G_BUS_NAME_WATCHER_FLAGS_AUTO_START</a></span><span class="symbol">;</span>

<span class="normal">  watcher_id </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="gio-Watching-Bus-Names.html#g-bus-watch-name">g_bus_watch_name</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_system_bus </span><span class="symbol">?</span><span class="normal"> <a href="GDBusConnection.html#G-BUS-TYPE-SYSTEM:CAPS">G_BUS_TYPE_SYSTEM</a> </span><span class="symbol">:</span><span class="normal"> <a href="GDBusConnection.html#G-BUS-TYPE-SESSION:CAPS">G_BUS_TYPE_SESSION</a></span><span class="symbol">,</span>
<span class="normal">                                 opt_name</span><span class="symbol">,</span>
<span class="normal">                                 flags</span><span class="symbol">,</span>
<span class="normal">                                 on_name_appeared</span><span class="symbol">,</span>
<span class="normal">                                 on_name_vanished</span><span class="symbol">,</span>
<span class="normal">                                 <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span>
<span class="normal">                                 <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">);</span>

<span class="normal">  loop </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="./../glib/glib/glib-The-Main-Event-Loop.html#g-main-loop-new">g_main_loop_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> <a href="./../glib/glib/glib-Standard-Macros.html#FALSE:CAPS">FALSE</a></span><span class="symbol">);</span>
<span class="normal">  </span><span class="function"><a href="./../glib/glib/glib-The-Main-Event-Loop.html#g-main-loop-run">g_main_loop_run</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">loop</span><span class="symbol">);</span>

<span class="normal">  </span><span class="function"><a href="gio-Watching-Bus-Names.html#g-bus-unwatch-name">g_bus_unwatch_name</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">watcher_id</span><span class="symbol">);</span>

<span class="label"> out:</span>
<span class="normal">  </span><span class="function"><a href="./../glib/glib/glib-Commandline-option-parser.html#g-option-context-free">g_option_context_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_context</span><span class="symbol">);</span>
<span class="normal">  </span><span class="function"><a href="./../glib/glib/glib-Memory-Allocation.html#g-free">g_free</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">opt_name</span><span class="symbol">);</span>

<span class="normal">  </span><span class="keyword">return</span><span class="normal"> </span><span class="number">0</span><span class="symbol">;</span>
<span class="cbracket">}</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

</div>
<p><br class="example-break">
</p>
</div>
<div class="refsect1">
<a name="gio-Watching-Bus-Names.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GBusNameAppearedCallback"></a><h3>GBusNameAppearedCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                (*GBusNameAppearedCallback)         (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name_owner</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Invoked when the name being watched is known to have to have a owner.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>The <a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> the name is being watched on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name being watched.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_owner</code></em> :</span></p></td>
<td>Unique name of the owner of the name being watched.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data passed to <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="GBusNameVanishedCallback"></a><h3>GBusNameVanishedCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                (*GBusNameVanishedCallback)         (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Invoked when the name being watched is known not to have to have a owner.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>The <a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> the name is being watched on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name being watched.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data passed to <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="GBusNameWatcherFlags"></a><h3>enum GBusNameWatcherFlags</h3>
<pre class="programlisting">typedef enum
{
  G_BUS_NAME_WATCHER_FLAGS_NONE = 0,
  G_BUS_NAME_WATCHER_FLAGS_AUTO_START = (1&lt;&lt;0)
} GBusNameWatcherFlags;
</pre>
<p>
Flags used in <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="G-BUS-NAME-WATCHER-FLAGS-NONE:CAPS"></a><span class="term"><code class="literal">G_BUS_NAME_WATCHER_FLAGS_NONE</code></span></p></td>
<td>No flags set.
</td>
</tr>
<tr>
<td><p><a name="G-BUS-NAME-WATCHER-FLAGS-AUTO-START:CAPS"></a><span class="term"><code class="literal">G_BUS_NAME_WATCHER_FLAGS_AUTO_START</code></span></p></td>
<td>If no-one owns the name when
beginning to watch the name, ask the bus to launch an owner for the
name.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name"></a><h3>g_bus_watch_name ()</h3>
<pre class="programlisting"><a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name                    (<em class="parameter"><code><a class="link" href="GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);</pre>
<p>
Starts watching <em class="parameter"><code>name</code></em> on the bus specified by <em class="parameter"><code>bus_type</code></em> and calls
<em class="parameter"><code>name_appeared_handler</code></em> and <em class="parameter"><code>name_vanished_handler</code></em> when the name is
known to have a owner respectively known to lose its
owner. Callbacks will be invoked in the <GTKDOCLINK HREF="g-main-context-push-thread-default">thread-default main
loop</GTKDOCLINK> of the thread you are calling this function from.
</p>
<p>
You are guaranteed that one of the handlers will be invoked after
calling this function. When you are done watching the name, just
call <a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> with the watcher id this function
returns.
</p>
<p>
If the name vanishes or appears (for example the application owning
the name could restart), the handlers are also invoked. If the
<a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> that is used for watching the name disconnects, then
<em class="parameter"><code>name_vanished_handler</code></em> is invoked since it is no longer
possible to access the name.
</p>
<p>
Another guarantee is that invocations of <em class="parameter"><code>name_appeared_handler</code></em>
and <em class="parameter"><code>name_vanished_handler</code></em> are guaranteed to alternate; that
is, if <em class="parameter"><code>name_appeared_handler</code></em> is invoked then you are
guaranteed that the next time one of the handlers is invoked, it
will be <em class="parameter"><code>name_vanished_handler</code></em>. The reverse is also true.
</p>
<p>
This behavior makes it very simple to write applications that wants
to take action when a certain name exists, see <a class="xref" href="gio-Watching-Bus-Names.html#gdbus-watching-names" title="Example 9. Simple application watching a name">Example 9, “Simple application watching a name”</a>. Basically, the application
should create object proxies in <em class="parameter"><code>name_appeared_handler</code></em> and destroy
them again (if any) in <em class="parameter"><code>name_vanished_handler</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bus_type</code></em> :</span></p></td>
<td>The type of bus to watch a name on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to not exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data to pass to handlers.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data_free_func</code></em> :</span></p></td>
<td>Function for freeing <em class="parameter"><code>user_data</code></em> or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name-on-connection"></a><h3>g_bus_watch_name_on_connection ()</h3>
<pre class="programlisting"><a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name_on_connection      (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameAppearedCallback" title="GBusNameAppearedCallback ()"><span class="type">GBusNameAppearedCallback</span></a> name_appeared_handler</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameVanishedCallback" title="GBusNameVanishedCallback ()"><span class="type">GBusNameVanishedCallback</span></a> name_vanished_handler</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="./../glib/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> user_data_free_func</code></em>);</pre>
<p>
Like <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a> but takes a <a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> instead of a
<a class="link" href="GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>A <a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_handler</code></em> :</span></p></td>
<td>Handler to invoke when <em class="parameter"><code>name</code></em> is known to not exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data to pass to handlers.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data_free_func</code></em> :</span></p></td>
<td>Function for freeing <em class="parameter"><code>user_data</code></em> or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-unwatch-name"></a><h3>g_bus_unwatch_name ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                g_bus_unwatch_name                  (<em class="parameter"><code><a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> watcher_id</code></em>);</pre>
<p>
Stops watching a name.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>watcher_id</code></em> :</span></p></td>
<td>An identifier obtained from <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name-with-closures"></a><h3>g_bus_watch_name_with_closures ()</h3>
<pre class="programlisting"><a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name_with_closures      (<em class="parameter"><code><a class="link" href="GDBusConnection.html#GBusType" title="enum GBusType"><span class="type">GBusType</span></a> bus_type</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);</pre>
<p>
Version of <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name" title="g_bus_watch_name ()"><code class="function">g_bus_watch_name()</code></a> using closures instead of callbacks for
easier binding in other languages.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bus_type</code></em> :</span></p></td>
<td>The type of bus to watch a name on.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_closure</code></em> :</span></p></td>
<td>
<a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_closure</code></em> :</span></p></td>
<td>
<a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to not exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.
Rename to: g_bus_watch_name</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
<hr>
<div class="refsect2">
<a name="g-bus-watch-name-on-connection-with-closures"></a><h3>g_bus_watch_name_on_connection_with_closures ()</h3>
<pre class="programlisting"><a href="./../glib/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>               g_bus_watch_name_on_connection_with_closures
                                                        (<em class="parameter"><code><a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a> *connection</code></em>,
                                                         <em class="parameter"><code>const <a href="./../glib/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> flags</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_appeared_closure</code></em>,
                                                         <em class="parameter"><code><a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> *name_vanished_closure</code></em>);</pre>
<p>
Version of <a class="link" href="gio-Watching-Bus-Names.html#g-bus-watch-name-on-connection" title="g_bus_watch_name_on_connection ()"><code class="function">g_bus_watch_name_on_connection()</code></a> using closures instead of callbacks for
easier binding in other languages.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>connection</code></em> :</span></p></td>
<td>A <a class="link" href="GDBusConnection.html" title="GDBusConnection"><span class="type">GDBusConnection</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>The name (well-known or unique) to watch.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>Flags from the <a class="link" href="gio-Watching-Bus-Names.html#GBusNameWatcherFlags" title="enum GBusNameWatcherFlags"><span class="type">GBusNameWatcherFlags</span></a> enumeration.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_appeared_closure</code></em> :</span></p></td>
<td>
<a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name_vanished_closure</code></em> :</span></p></td>
<td>
<a href="./../gobject/gobject/gobject-Closures.html#GClosure"><span class="type">GClosure</span></a> to invoke when <em class="parameter"><code>name</code></em> is known
to not exist or <a href="./../glib/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>An identifier (never 0) that an be used with
<a class="link" href="gio-Watching-Bus-Names.html#g-bus-unwatch-name" title="g_bus_unwatch_name ()"><code class="function">g_bus_unwatch_name()</code></a> to stop watching the name.
Rename to: g_bus_watch_name_on_connection</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.26</p>
</div>
</div>
</div>
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